Ink cartridge



FIG. 1 is a left side elevation view of an ink cartridge showing our new design;

FIG. 2 is a front elevation view thereof; and,

FIG. 3 is a bottom plan view thereof.

The right side, rear and top views are not claimed.

The broken lines in the drawings represent environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for an ink cartridge, as shown and described. 